Grinding machine



oct. 11, i927.

, J. L. BALLAsH GRINDING MACHINE.

Filed March 28,71925 24 27 :w zz Y Patented oct. 11, 1927.

UNITED` kSTATES fra-rear reise.

JOSEPH L. BALLASH, OF CLEVELAND, CHO, ASGNOR T0 THE CLEVELAND STONE COMPANY, 0F CLEVELAND, Cit-IEC, A COR-EORATGN OF OHIO.

Gninnine naciente.

Application inea earch es, semi naiaas.

space, is readily accessible and easily keptY clean. il further object Lo provide a construction in vvhlcli machining of the shaft supporting portions of the jupporting stand to obtain proper positioning of the hait is unnecessary.

ifi further object is to provide means for ventilating the Vmotor Without permitting the entry of grit and dust thereto.

-With the above and other objects in vieu7 the invention may be said to comprise the grinding machine as illustrated in the acconipanying drawing hereinafter described and particularly set forth in the appended claims, together with such variations and modifications thereof asvvill be apparent to one skilled in the art to which the invention appertains.

Reference should be had to the accompanying drawings forminga part of this specification in which Fig. 1 isa front elevation of a grinding machine embodying the.

invention; Fig. 2 is a transverse section eX- tending longitudinally of the grinding Wheel shaft and showing the shaft and motor casing andthe manner in Which the saine is mounted upon the supporting stand; `Fig. 3, is a section on line 3-3 of Fig. 2.

Referring to the accompanying drawings, the reference numeral 1 indicates the holloiv box-like supporting stand upon which the mechanism is mounted, the grinding mechanism comprising a pair of grinding Wheels 2 which are mounted upon opposite ends of. a shaft 3 which extends across the top of the stand 1 lengthwise thereof. The grinding Wheels 2 are secured upon the ends of the shaft 3 beyond the ends of the stand 1 by means of clamping plates l and 5, the

inner clamping plates 4 being liXed to theV shaft 3 and the outer clamping plates 5 being secured against the outer faces of the Wheels 2 by means of nuts 6 threaded upon the ends of the shaft 3.'

The stand 1 is provided at the ends thereof with raised supporting portions 7 which are provided at the top vvithr transversely concave seats 8, the stand 1 having a. depressed portion 9- between the raised supporting portions 7. Vlhe sluit wnhiii a cam; extend 'tli of the lf 1 m11 casing has @nu x d p A iig beit shaped inner end ii and an integr-ai bearing receiving portion Zuivithinthe flaring endsI ll.

i ie two enus oi' thee-using are of exactly the construction, it "eing understood that: the construction shown in Fig. 2 is duplicated at the opposite end oi the supporting stand. Uutirardly from the inner flaring ends 11 the end members 10 of the casing` have portions 13 of reduced diameter which he in the conci`l 'e seats 8 at the ends of the v7" supporting stand. Outside the reduced portion; 13 the casing members 10 are provided with a bearing receiving portion la. l/Vitliin the inner bearing receiving portion 12 there is mounted a haii bearing 15 and the portion 12 is provide/i with an integral flange 16 on the outer side of the bearing l5 Which surrounds asleeve 17 on the shaft and is provided with a packing ring 18 in the edge thereof engaging the sleeve 17. Qn the innersideof the bearing 15 there is an annular disk 19 which surrounds the shaft and is secured to the bearing` supporting portion 12, the disk 19 being provided at its inner edge With a packing ring 20 which engages the shaft. rlhe iange 16 and disk 19 serve to retain lubricant Within the bearing 15, suitable passages 21 being provided through the Wall of the casing for supplying lubricant to the bearing. A ball bearing 22 is mounted tvithin the outer end portion 14; of the casingV members 10 and, on the inner side of the bearing 22, the casing is provided With Y an inwardly projecting flange 23 Which car- 95 ries a packing ring` 2e `bearing on the sleeve 17. r1fhe outerend of the portion 14 is internally threaded to receive an annular nut 25 which surrounds a ring 26 on the shaft and. carries a packing ring 27 which bears against the ring. rlhe nut 25 and inner flange 23 serve to retain lubricant Within the bearing 22 and suitable passages 22a are provided through the Wall of the casing fo supplying lubricant to theV bearing.

The edges of the enlarged inner ends 11 of the end membersof the casing are provided vithI shoulders 2S upon which a cylindricalv band 29 is supported, the portions 11 and the band 29 forming an enlarged chamber at the center of the casing to receive the motor for driving the shaft 3, the portions ll have bosses 30 formed on the inner side thereof adjacent the edges to receive fastening bolts 3l which secure stator supporting rings 32 in the casing. The rings are L-shaped in cross section, having a cylindrical flange Which fits within the band 29 and an inwardly extending flange which supports a stator 83 which cooperates with a rotor 34 secured to the shaft 3 within the stator. A key 35 is secured upon the exterior of the band 29 by means of screws 86 extending through the key 35 and band 29 into the rings 32. The key 35 lits in a suitable slot or groove in the bottom of the depressed portion 9 of the supporting stand and serves to lock the motor casing against rotation. The key 35 Vand fastening screws also serve to hold the rings 32 against separation.

`Means are provided for Ventilating the motor casing in such a manner as to prevent entry of dust and grit produced in the grinding operations into the motor casing. The air enters the motor casing from the interior ofthe hollow supporting stand 1 through aligned openings 37 and 38 in one of the end portions ll of the casing and in l the top of the supporting stand, t-he openi the air toward the center.

ings 37 being adjacent the bearing receiving portion l2 so that air is admitted adjacent the center of the motor, a conical shield 39 being provided within the casing to direct The air is discharged from the motor casing into the interior of the supporting stand through an opening 40 in the band 29 Yand a registering opening il in ther bottom of the depression 9 of the supporting stand. The stand l is provided with screened Ventilating openings which are positioned immediately beneath brackets i3 adjacent the ends of the stand which support adjustable work holders 4.a. The shaftsupporting and motor enclosing casingl is retained on the stand l by means of cap plates Ll5 and i6 which fit in Athe reduced pcrtionsrl of the casing and are bolted to raise portions .7 of the standen opposite sides of the concave seats 8. n In order to malt-c unnece :ary the machining of the seats on the supporting stand to obtain accurate positioning of the grinding wheel shaft, a i'illcr et@ of labbitt metal may be interposed between the reduced portion 13 of the casing and the seat 8 and cap The grinding wheel shaft and the shaft 'supporting motor enclosing casing form a removable unit which may be quickly removed from the stand if it should become necessary to repair the motor or bearings. When removed from the stand access may be had to the motor by removing the key 35 and'loosening the retaining bolts 3l which will permit the end members l0 to be slipped endwise on the shaft. Since the securing bolts 31 are Within the motor enclosing por'- tion of the casing, the casing has a smooth exterior surface which may be easily kept clean. The cap plates 45 are also flush With the exterior of the casing so that there are no shoulders and recesses for the accumulation of dust and dirt.

l-Iaving described my invention, I claim:

l. In a machine of the character described, the combination with a supporting stand having spaced aligned seats, of a mechanism d'etachably mounted on the stand, said mechanism comprising a motor casing having an enlarged central portion and axially aligned tubular extensions, said extensions resting on said seats and supporting the casing thereon, a shaft extending through said casing and projecting beyond said extensions, bearings for said shaft within said extension, means for securing said extensions to said seats and for holding vsaid casing against rotatinn, and a motor ,within the enlarged central portion of the casing comprising a rotor lixed to the shaft and a stator lixed to said casinof.

2. In a machine of the character described, the combination with a supporting stand having axially aligned concave seats, of a mechanism detachably mounted on the stand, said mechanism comprising a motor casing having an enlarged central port-ion and axially aligned tubular extensions at opposite ends, each extension having a portion of reduced diameter intermediate the ends thereof adapted to lie in one of said seats, a shaft extending through the casing and extending beyond the extensions, bearings'for the shaft at the outer ends of the extensions and within the reduced portions of the extensions, means for clamping the reduced portions of the extensions on said seats, means for holding the casing against rotation, and a motor for driving said shaft comprising-a rotor fixed to the shaft and a stator fixed to Vsaid casing.

In a machine of the character described, the combination with a supporting stand having axially aligned concave seats at the apposite ends` thereof, of a mechanism detachably mounted on the stand comprising a motor casing having anenlarged center' portion and axially aligned tubular extensions at the ends thereof, each extension having a portion of reduced diameter adapted to lie in one of said seats, a shaft extending through the casing and extending beyond the ends of the extensions, bearings for said shaft in said extensions, cap plates for clamping the extensions to said seats, a filler of Babbitt metal between the seats and casing extensions and between said extensions and cap plates, a key and slot connection betweenv the enlarged portion of the casing and the supporting stand, and a motor within the enlarged portion of the casing comprising a stator fixed to the casing and a rotor fixed to the shaft.

4. In a machine of the character described, the combination with a supporting stand having axially aligned concave seats, of a motor casing adapted to be detachably mounted on said stand, said casing comprising a cylindrical motor enclosing band and end members upon which said band is secured, 'each end member having a tubular extension co-axial with said band and adapted to lie in said concave seats, a shaft extending axially through the extensions, said shafts being journaled in said extensions and projecting beyond the ends thereof, bearings for said shaft Within the side members adjacent the inner end and adjacent the outer 'end of the extensions, means for clamping the said extensions on said seats, means interposed between said band and the supporting stand for holding thev casing against rotation and a motor comprising a stator fixed to the casing and a rotor fixed to the shaft.

5. In a machine of the character described, the combination with a hollow supporting stand having its top provided with raised portions at the ends thereof, formed to provide axially aligned concave seats and a depressed portion between said raised portions, of a motor casing adapted to be detachably mounted in the stand, said casing comprising an enlarged central portion and axial tubular extensions on opposite sides of the central portion, said extensions fitting in said concave seats and said enlarged portion fitting in said depressed portion of the stand, a key on said enlarged portion of the casing and a slot in the depressed portion of the stand to receive said key, a shaft extending through the casing and journaled in said extensions, and a motor for driving the shaft comprisinga rotor secured to the shaft and a stator secured to the casing, the motor casing and the top of the stand having registering openings at one end of the enlarged portion of the casing and centrally thereof for Ventilating the motor.

6. In a grinding machine, a supporting stand, a shaft extending across the top of the stand, a casing enclosing said shaft between the ends thereof and secured against rotation on the supporting stand, said casing having portions of reduced diameter at opposite ends thereof detachably secured upon the top of the supporting stand, bearings within the casing for rotatably supporting the shaft, and a motor within the casing vfor driving the shaft comprising a rotor secured to the shaft and a stator secured to the casing.

In testimony whereof, I hereunto aiiix my signature.

JOSEPH L. BALLASI-I. 

